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In-home air purifiers really do work. However, their value depends on what you're trying to achieve. Mechanical air filters other than those with true HEPA filtration aren't capable of removing bacteria and viruses from the air. However, many of them can reduce very fine particles, including pollen, a known allergen. On the other hand, UV light filters can remove harmful pathogens but can't remove particles.  

No, running your furnace without an air filter isn’t better than running it with a dirty filter. Even if it’s dirty, a filter will still prevent particles from blowing around your ducts and your house. However, neither of these options is good for your furnace or your health. Replace your filter once every one to three months for optimal furnace performance and air quality.

Most services take 2-5 hours, though full unit replacements or extensive repairs may take longer.

If you don't regularly change your HVAC air filter, it will become clogged with dust, dirt, and other contaminants. This blockage forces the system to work harder to circulate air, leading to several negative consequences. You may experience higher energy bills, poor temperature regulation, reduced air quality, and slower system performance. Over time, this added strain can cause parts to break more frequently, lead to system failure, and ultimately shorten the lifespan of your entire HVAC unit. In some cases, it can also contribute to health problems. It's recommended to change the filter at least every three months.